//package chapter9;
//
//import java.util.Arrays;
//
//import javax.crypto.*;
//
//import org.bouncycastle.cms.*;
//
///**
// * Demonstrate creation and processing a key-encrypted key enveloped-message.
// */
//public class KEKEnvelopedDataExample {
//    public static void main(String[] args)
//            throws Exception {
//        KeyGenerator keyGen = KeyGenerator.getInstance("DESEDE", "BC");
//        SecretKey key = keyGen.generateKey();
//
//        // set up the generator
//        CMSEnvelopedDataGenerator edGen = new CMSEnvelopedDataGenerator();
//
//        byte[] kekID = new byte[]{1, 2, 3, 4, 5};
//
//        edGen.addKEKRecipient(key, kekID);
//
//        // create the enveloped-data object
//        CMSProcessable data = new CMSProcessableByteArray("Hello World!".getBytes());
//
//        CMSEnvelopedData enveloped = edGen.generate(
//                data,
//                CMSEnvelopedDataGenerator.AES128_CBC, "BC");
//        // recreate
//        enveloped = new CMSEnvelopedData(enveloped.getEncoded());
//
//        // look for our recipient
//        RecipientId recId = new RecipientId();
//
//        recId.setKeyIdentifier(kekID);
//
//        RecipientInformationStore recipients = enveloped.getRecipientInfos();
//        RecipientInformation recipient = recipients.get(recId);
//
//        if (recipient != null) {
//            // decrypt the data
//            byte[] recData = recipient.getContent(key, "BC");
//
//            // compare recovered data to the original data
//            if (Arrays.equals((byte[]) data.getContent(), recData)) {
//                System.out.println("data recovery succeeded");
//            } else {
//                System.out.println("data recovery failed");
//            }
//        } else {
//            System.out.println("could not find a matching recipient");
//        }
//    }
//}